US7766103B2 - Drill bit and a single pass drilling apparatus - Google Patents

Drill bit and a single pass drilling apparatus Download PDF

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Publication number
US7766103B2
US7766103B2 US12/068,950 US6895008A US7766103B2 US 7766103 B2 US7766103 B2 US 7766103B2 US 6895008 A US6895008 A US 6895008A US 7766103 B2 US7766103 B2 US 7766103B2
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US
United States
Prior art keywords
drill bit
machining means
rock machining
drilling
rock
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US12/068,950
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English (en)
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US20080205994A1 (en
Inventor
Pierre Ravat
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Sandvik Intellectual Property AB
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Sandvik Intellectual Property AB
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Filing date
Publication date
Priority claimed from SE0700383A external-priority patent/SE0700383L/xx
Priority claimed from SE0700384A external-priority patent/SE0700384L/xx
Application filed by Sandvik Intellectual Property AB filed Critical Sandvik Intellectual Property AB
Assigned to SANDVIK INTELLECTUAL PROPERTY AB reassignment SANDVIK INTELLECTUAL PROPERTY AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RAVAT, PIERRE
Publication of US20080205994A1 publication Critical patent/US20080205994A1/en
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Expired - Fee Related legal-status Critical Current
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/64—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/36—Percussion drill bits
    • E21B10/40—Percussion drill bits with leading portion
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
    • E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
    • E21D21/0033—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts having a jacket or outer tube
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/55—Cutting by use of rotating axially moving tool with work-engaging structure other than Tool or tool-support
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/905—Having stepped cutting edges

Definitions

  • the present disclosure relates to a drill bit and a single pass drilling apparatus. More particularly, the disclosure relates to a drill bit having a plurality of rock machining means arranged relative to the direction of rotation and angularly spaced apart from one another about the drilling axis.
  • the disclosure references single pass drilling, however, it is to be appreciated that the drill bit is not limited to that use and may find application in a broad range of drilling operations.
  • the installation of anchor bolts to reinforce excavations is usually carried out in two distinct steps. Usually, a bore is drilled and the drill steel and bit extracted before the bolt is inserted into the bore and tightened or grouted.
  • Single pass anchor bolting involves carrying out these two steps simultaneously, with the task of removing the drill steel to insert the bolt being eliminated.
  • the advantages of single pass bolting include minimizing the time required for bolt installation, improving safety for drilling equipment operators, when comparing with manual or semi manual bolting, and enhancing prospects for full automation of the process.
  • a further advantage is improved quality and precision of anchor bolt installation, when comparing with manual or semi manual bolting.
  • the diameter of the bore is critical for anchor bolt performance in the case of friction, e.g. Split set bolts.
  • Still a further advantage with single pass bolting is that the bore cannot collapse when retracting the drill bit since the bolt is already in the bore. This leads to much better efficiency as the bolt is always installed; i.e., there will be no lost holes.
  • Prior attempts at single pass bolting have generally been targeted at innovative anchor bolts, which also act as the drill steel, having a drill bit provided about an end thereof.
  • Such apparatus are used via a rotational drilling method or a rotary/percussive drilling method and are generally unsuitable for hard ground conditions.
  • Existing hard ground percussive anchor bolts that do not reuse the drill bit suffer from cost problems.
  • a wide variety of roof bolts exist and one particular form is tubular (e.g. split-sets, Swellex, etc. . . . ), having a central bore formed lengthwise through the bolt. Drill bits adapted to be extracted through a casing have been complex and accordingly expensive.
  • a drill bit has been proposed in Swedish Patent Application No. 0400597-1 that has a reamer part that incorporates rock machining elements which are disposed non-symmetrically about the drill bit axis.
  • This construction allows a bore diameter to be formed that is larger than the diameter of the drill bit, thereby allowing removal of the bit through a casing.
  • the penetration profile of the drill bit has been found to be non-uniform thereby causing stress on the bit which can reduce the bit's efficiency and service life.
  • Exemplary embodiments of the disclosed drill bit have as one object to substantially overcome one or more of the above-mentioned problems associated with the prior art, or at least to provide an alternative thereto. Still another object is to provide a drill bit and a single pass drilling apparatus that are more effective and so to make use of single pass bolting in the mining industry more attractive.
  • An exemplary drill bit rotatable about a drilling axis comprises a bit body, a leading end and a trailing end spaced apart in a direction of the drill axis, and, relative to a direction of rotation, a leading first rock machining means and at least one trailing first rock machining means, the leading first rock machining means and the trailing first rock machining means being disposed on the bit body and angularly spaced apart from one another about the drill axis, wherein at least one of the trailing first rock machining means is also axially spaced from the leading first rock machining means in a direction towards the leading end of the drill bit.
  • An exemplary single pass drilling apparatus comprises drilling means, an anchor bolt, and an embodiment of a one-piece drill bit as variously disclosed herein.
  • FIGS. 1A-1G schematically show a sequence of single pass roof bolting.
  • FIG. 2A shows an exemplary embodiment of a drill bit in a front elevational view.
  • FIG. 2B shows the drill bit of FIG. 2A in a side elevational view.
  • FIG. 2C shows the drill bit of FIG. 2A in a front view.
  • FIG. 3 is a schematic view of the drill bit during drilling of a bore in rock in a side elevational view.
  • FIG. 4 shows the drill bit in a front view in relation to a bore profile.
  • FIGS. 1A-1G show a single pass drilling apparatus 10 using a drill bit 16 and FIGS. 2A-2C more closely show the drill bit 16 .
  • the single pass drilling apparatus 10 comprises several parts; e.g., an elongated drill steel 11 having a leading end 12 and a trailing end, not shown, reference being had to a drilling direction F.
  • the leading end 12 has a connection portion comprising a thread, a taper or a bayonet connection, not shown.
  • a one-piece drill bit 16 is provided having rock machining means 17 and 18 A, 18 B, 18 C.
  • the drill bit 16 is connectable to the drill steel via a connection portion comprising a thread, a taper or a bayonet connection (not shown).
  • the drill steel 11 and the drill bit constitute drilling means.
  • the single pass drilling apparatus 10 further comprises an anchor bolt 21 adapted to at least partially enclose the drill steel 11 .
  • the anchor bolt 21 has open ends. The greatest diametrical dimension of the drill bit is smaller
  • the basic idea of the single pass drilling apparatus 10 is to drill the bore while the bolt encloses the drill steel, and then to retract the bit to be used again. There are no losses of bit parts.
  • the single pass drilling apparatus 10 has been more closely described in Swedish Patent Application No. 0400597-1 (corresponding to WO 2005/085582) the disclosure of which is hereby incorporated by reference.
  • the drill bit 16 can be designed as follows, reference being had to FIGS. 2A to 2C .
  • the one-piece drill bit 16 comprises a body 25 made of steel and the rock machining means 17 , 18 disposed on the body.
  • the body 25 has a leading end 27 and a trailing end 28 and incorporates two integral parts, i.e., a pilot part 14 long enough to guide the entire apparatus 10 properly where the axis CL 1 of the pilot part 14 coincides with the axis CL 3 of the bore 22 , and a reamer part 19 .
  • the centre axis or middle line CL 1 of the pilot part 14 substantially coincides with the centre axis of the rock bolt during drilling and therefore can be regarded as the drilling axis of the drill bit, but axis CL 1 does not coincide with the axis CL 3 during retraction of the drilling bit.
  • the centre axis or middle line CL 2 of the reamer part 19 and the axis of the drill steel 11 coincide, but are substantially spaced from the axis CL 3 of the bore 22 . It should be noted that neither the pilot part nor the reamer part has to be circular in cross-section, so reference to axes CL 1 and CL 2 shall be understood as reference to average middle lines in the respective parts.
  • the rock machining means are in the form of cemented carbide means, i.e., chisels and/or buttons.
  • the pilot part 14 has a front face 29 which forms the leading end 27 of the bit 16 and carries a diametrically extending chisel or two diametrically opposed front buttons (given general reference 17 ).
  • the reamer part has a front face 30 carrying a plurality of buttons 18 ; in this case three front buttons 18 A, 18 B and 18 C.
  • the buttons 18 A, 18 B and 18 C may project somewhat outside the periphery of the reamer part in order to machine a bore 22 during drilling which has a bigger diameter than the steel body 25 .
  • the number of cemented carbide buttons in the reamer part can be varied depending on how great the diameter of the drill bit is. Chipways or recesses can be provided in areas between adjacent reamer buttons, through which flush medium can pass.
  • the rock drill bit 16 is to be coupled to the drill steel 11 by means of a connection portion, so as to transfer rotational movement and percussion in the usual manner.
  • the drill steel 11 includes a channel for conveying a flush medium.
  • a main channel for flush medium is provided inside the drill bit. This main channel communicates at its forward end with a number of branch channels, which exit in the front faces.
  • the flush medium will in practice be water, cement or air.
  • the pilot part drills a pilot bore 22 A of less diameter and length in relation to the bore 22 .
  • the length of the pilot part 14 is defined as the distance between the forwardmost portion of the pilot part and the forwardmost reamer button 18 C, in a direction parallel to the reamer part centre line CL 2 .
  • the length is at least 10 mm and not more than 60 mm to provide good guidance of and good service life for the drill bit.
  • the reamer buttons in this embodiment comprises a leading button 18 A, and trailing buttons 18 B and 18 C (as the drill bit 16 is arranged to undergo left hand rotation under drilling).
  • the buttons are angularly spaced about the drilling axis CL 1 at equal spacings and are disposed in a sector S having a sector angle ⁇ .
  • the spacings may in some cases be different, i.e., not identical.
  • the radial arms of the sector travel through the mid points of the respective extreme buttons 18 A and 18 C.
  • This angle ⁇ is less than 120° and preferably less than 90°. In the illustrated form, the angle is approximately 76°.
  • buttons 18 A, 18 B and 18 C are also axially spaced relative to one another. Again in the illustrated form, this axial displacement is constant with each of the trailing buttons 18 B and 18 C being spaced towards the leading end 27 of the drill bit 16 from its immediately preceding button. With this angular and axial spacing, the buttons 18 A, 18 B and 18 C line on an arc that forms part of a helix PD having a constant radius and pitch, and having a pitch angle ⁇ inclined to a plane normal to the drilling axis. In the shown embodiment, there is the same altitude difference between buttons. The axial spacing may alternatively be different to get more flexibility regarding capability to perform well for a wider range of penetration rates, for instance.
  • the pitch angle ⁇ changes the penetration profile of the drilling tip and the degree of pitch angle that is most effective depends on drilling conditions and, in particular, penetration rates.
  • the pitch angle ⁇ will be in the range of 5-10° with the illustrated form being approximately 8°.
  • the orientation of the reamer buttons 18 A, 18 B and 18 C is designed to improve the effectiveness of the drilling bit particularly, as in the present case, where the reamer buttons 18 A, 18 B and 18 C are confined to a small sector defined by sector angle ⁇ .
  • the reamer buttons are both rotated (about axis CL 1 ) and caused to impact the rock face. Each impact is caused to move the drilling bit in the drilling direction F. Consequently, this combined rotary and axial movement causes the reamer buttons 18 A, 18 B, and 18 C to follow a generally helical path PC of constant radius and pitch as illustrated in FIG. 3 .
  • the anticipated pitch PC can be determined from the drilling speed (rate of penetration/time) and rate of rotation of the drill bit.
  • reamer buttons By forming the reamer buttons on the drill bit on an arc that forms part of a helix PD that is wound in the opposite direction to the expected helical cutting path PC, more effective drilling may be achieved as compared to the arrangement where the reamer buttons are aligned normal to the drilling axis.
  • reamer buttons are better presented to the cutting face resulting in the reaction forces on the reamer 19 being more evenly distributed across each of the reamer buttons ( 18 A, 18 B, 18 C) with each button needing to cut a substantially equal slice of rock. If the reamer buttons were normal to the drilling axis, then the majority of work is done by the leading button 18 A. Moreover, displacing the reamer buttons axially by the amount D (see FIG.
  • an outer surface 31 of the drill bit incorporates at least one bearing region 32 which in use is arranged to bear against the inner wall of the bore thereby assisting in maintaining the bit in its correct orientation.
  • this bearing region is disposed along the length of the surface of the drill bit 16 under the reamer part 19 .
  • This region forms part of the skirt that locates around the drill steel 11 .
  • the bearing region may be disposed on only a portion of the reamer outer surface, for example, immediately under the reamer buttons 18 and/or adjacent the trailing end 28 of the drill bit 16 .
  • the cross-section (normal to the drilling axis) is such that the radial distance of the outer surface from the drilling axis varies about the bit.
  • the bearing region 32 is disposed at the outermost part of the drill bit surface 31 and is configured so as to extend angularly about the drilling axis at a constant radial distance. This radial distance corresponds to the radius of the bore 22 formed by the reamer part 19 . This is best illustrated in FIG. 4 .
  • the bearing region 32 typically includes wear resisting means so as to be of a harder material than the main bit body. Whilst the bearing region 32 may be generally linear extending about the drilling axis (and be in the form of a ridge or rib or the like), in the illustrated form, the bearing region also extends axially relative to the drilling axis and is therefore in the form of a bearing surface. This bearing surface may extend from the leading to trailing end of the reamer part, only part way along the surface, or as mentioned above may be in separate sections to form a plurality of bearing regions.
  • FIGS. 1A-1G The operation of the single pass rock bolting apparatus 10 is shown in FIGS. 1A-1G .
  • the drill bit 16 is connected, for example threaded, to the drill steel 11 .
  • a drilling machine such as a standard drill jumbo, holds the drill steel.
  • the bolt 21 is preferably automatically fed around the drill steel and positioned behind the drill bit 16 in the drilling direction F.
  • the pilot part 14 primarily will abut against the rock such that for a short while it will machine the rock surface during circular interpolation. Then the pilot part 14 will find its correct centre and begin to drill centrally while the drill steel 11 simultaneously starts wobbling about the pilot part middle line CL 1 .
  • the reamer part 19 gets in contact with the rock surface and begins to ream the hole made by the pilot part 14 with the bearing region 32 locating against the inner wall of the bore 22 to support the drill bit 16 .
  • the bolt 21 reaches the hole and is forced into the hole as shown in FIG. 1C .
  • the bolt 21 diameter is preferably less than that of the bore 22 .
  • the drill bit 16 will continue to drill and ream the bore 22 , while the bolt is pushed forwardly by a coupling sleeve 26 of the drilling machine, see FIG. 1D , until feed of the different parts is stopped.
  • the depth of the bore 22 is substantially determined by the length of the bolt 21 , i.e., when a washer 23 positioned at the trailing end of the bolt reaches the rock face or entrance of the bore further feed will be stopped, see FIG. 1E .
  • the bolt pusher is a coupling sleeve 26 or a dolly tool, which is driven by the drill steel.
  • the dolly tool usually rotates together with the drill steel and the bolt during insertion. However, for instance, the bolt may be held such that it does not rotate during insertion, e.g., in the case of a mechanical anchor bolt.
  • the dolly tool can torque the anchor bolt when fully inserted.
  • the dolly tool can also slide along the drill steel to allow an easier installation of mechanical shell bolts and grouted bolts.
  • FIG. 1E shows the anchor bolt 21 fully inserted, with the drill steel and drill bit still in the anchor bolt. A pusher pushes the plate to the rock face.
  • the washer could be a loose conventional plate having a central hole that cooperates with a bulge 24 at the trailing end of the bolt. Then the drill bit is retracted from the pilot hole 22 A, see FIG. 1F . It is preferable that the axial space between the bolt and the drill bit is greater than the depth of the pilot bore 22 A such that the leading end of the bolt does not interfere with the retraction of the drill bit.
  • the drill bit and the drill steel can be completely retracted and can be reused for repeated drilling operations.
  • the machine driving the apparatus 10 can be a top hammer drilling machine, a pure rotary machine or a down-the-hole equipment.
  • Exemplary embodiments of the disclosed drill bit provide good cutting and guiding and provide favorable drilling results.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Structural Engineering (AREA)
  • Earth Drilling (AREA)
US12/068,950 2007-02-14 2008-02-13 Drill bit and a single pass drilling apparatus Expired - Fee Related US7766103B2 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
SE0700383A SE0700383L (sv) 2007-02-14 2007-02-14 Verktyg
SE0700384-1 2007-02-14
SE0700384A SE0700384L (sv) 2007-02-14 2007-02-14 Verktyg
SE0700384 2007-02-14
SE0700383 2007-02-14
SE0700383-3 2007-02-14

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US20080205994A1 US20080205994A1 (en) 2008-08-28
US7766103B2 true US7766103B2 (en) 2010-08-03

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US (1) US7766103B2 (fr)
KR (1) KR101434244B1 (fr)
AU (1) AU2008216929B2 (fr)
DE (1) DE112008000158T5 (fr)
FI (1) FI125387B (fr)
WO (2) WO2008100194A2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2520998B (en) 2013-12-06 2016-06-29 Schlumberger Holdings Expandable Reamer
GB2528454A (en) 2014-07-21 2016-01-27 Schlumberger Holdings Reamer
WO2016014283A1 (fr) 2014-07-21 2016-01-28 Schlumberger Canada Limited Alésoir
GB2528458A (en) 2014-07-21 2016-01-27 Schlumberger Holdings Reamer
GB2528457B (en) * 2014-07-21 2018-10-10 Schlumberger Holdings Reamer
GB2528456A (en) 2014-07-21 2016-01-27 Schlumberger Holdings Reamer
GB2528459B (en) 2014-07-21 2018-10-31 Schlumberger Holdings Reamer

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2673717A (en) * 1951-03-14 1954-03-30 Oliver P Link Starting bit for rotary masonry bits
GB1033603A (en) 1962-07-09 1966-06-22 Atlas Copco Ab Improvements in rock drilling equipment
US3390730A (en) 1965-10-07 1968-07-02 Carrier & Ateliers Stenuick Fr Apparatus for lining a borehole as a boring bit advances in the ground
US3885638A (en) 1973-10-10 1975-05-27 Sam C Skidmore Combination rotary and percussion drill bit
US4461362A (en) * 1982-09-29 1984-07-24 Arnol Staggs Mining drill with apertures and collars providing for flow of debris
WO1996011323A1 (fr) 1994-10-05 1996-04-18 Ilomaeki Valto Appareil de forage permettant d'excaver dans differents types de sols et procede associe
US6309159B1 (en) * 1999-10-29 2001-10-30 Sandvik Ab Self drilling roof bolt
US6431295B1 (en) * 1999-09-09 2002-08-13 Hilti Aktiengesellschaft Rock drill
WO2002088523A1 (fr) 2001-04-26 2002-11-07 Techmo Entwicklungs- Und Vertriebs Gmbh Procede et dispositif de forage d'un trou et de fixation d'un ancrage dans un trou de forage
US6739416B2 (en) * 2002-03-13 2004-05-25 Baker Hughes Incorporated Enhanced offset stabilization for eccentric reamers
WO2005085582A1 (fr) 2004-03-10 2005-09-15 Sandvik Intellectual Property Ab Appareil de forage en un seul passage, utilisation d'un trepan monobloc, procede et boulon d'ancrage pour boulonnage des roches en un seul passage.
US20070000701A1 (en) * 2003-02-19 2007-01-04 Steven Weaver Drill bit, a drill rod and a self drilling roof bolt
WO2007030049A1 (fr) 2005-09-05 2007-03-15 Sandvik Intellectual Property Ab Trepan monobloc pour boulonnage d'ancrage en un seul passage et appareil de forage en un seul passage
US7392866B2 (en) * 2005-11-29 2008-07-01 The William Brady Loving Trust Roof drilling system improvements
US20080302577A1 (en) * 2007-06-06 2008-12-11 Pile James D Drill Bit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4016386A1 (de) * 1989-06-28 1991-01-03 Baroid Technology Inc Gebogenes bohrloch-motorgehaeuse
SE0700384L (sv) 2007-02-14 2008-04-01 Sandvik Intellectual Property Verktyg
SE0700383L (sv) 2007-02-14 2008-04-29 Sandvik Intellectual Property Verktyg

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2673717A (en) * 1951-03-14 1954-03-30 Oliver P Link Starting bit for rotary masonry bits
GB1033603A (en) 1962-07-09 1966-06-22 Atlas Copco Ab Improvements in rock drilling equipment
US3390730A (en) 1965-10-07 1968-07-02 Carrier & Ateliers Stenuick Fr Apparatus for lining a borehole as a boring bit advances in the ground
US3885638A (en) 1973-10-10 1975-05-27 Sam C Skidmore Combination rotary and percussion drill bit
US4461362A (en) * 1982-09-29 1984-07-24 Arnol Staggs Mining drill with apertures and collars providing for flow of debris
WO1996011323A1 (fr) 1994-10-05 1996-04-18 Ilomaeki Valto Appareil de forage permettant d'excaver dans differents types de sols et procede associe
US6431295B1 (en) * 1999-09-09 2002-08-13 Hilti Aktiengesellschaft Rock drill
US6309159B1 (en) * 1999-10-29 2001-10-30 Sandvik Ab Self drilling roof bolt
WO2002088523A1 (fr) 2001-04-26 2002-11-07 Techmo Entwicklungs- Und Vertriebs Gmbh Procede et dispositif de forage d'un trou et de fixation d'un ancrage dans un trou de forage
US7080697B2 (en) 2001-04-26 2006-07-25 “ALWAG” Tunnelausbau Gesellschaft m.b.H Method and device for drilling a hole and for securing an anchorage in a bore hole
US6739416B2 (en) * 2002-03-13 2004-05-25 Baker Hughes Incorporated Enhanced offset stabilization for eccentric reamers
US20070000701A1 (en) * 2003-02-19 2007-01-04 Steven Weaver Drill bit, a drill rod and a self drilling roof bolt
WO2005085582A1 (fr) 2004-03-10 2005-09-15 Sandvik Intellectual Property Ab Appareil de forage en un seul passage, utilisation d'un trepan monobloc, procede et boulon d'ancrage pour boulonnage des roches en un seul passage.
US20070274788A1 (en) 2004-03-10 2007-11-29 Pierre Ravat Single Pass Drilling Apparatus, Use of a One-Piece Drill Bit, Method and Rock Bolt for Single Pass Rock Bolting
WO2007030049A1 (fr) 2005-09-05 2007-03-15 Sandvik Intellectual Property Ab Trepan monobloc pour boulonnage d'ancrage en un seul passage et appareil de forage en un seul passage
US7392866B2 (en) * 2005-11-29 2008-07-01 The William Brady Loving Trust Roof drilling system improvements
US20080302577A1 (en) * 2007-06-06 2008-12-11 Pile James D Drill Bit

Also Published As

Publication number Publication date
KR20090119826A (ko) 2009-11-20
FI20095817A (fi) 2009-07-30
AU2008216929A1 (en) 2008-08-21
DE112008000158T5 (de) 2010-03-25
WO2008100195A1 (fr) 2008-08-21
AU2008216929B2 (en) 2010-11-25
WO2008100194A3 (fr) 2008-10-30
FI125387B (fi) 2015-09-30
US20080205994A1 (en) 2008-08-28
WO2008100194A2 (fr) 2008-08-21
KR101434244B1 (ko) 2014-08-27

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